This is something that i have found
(post from amazon review) by Ken M.: I did run a discharge test with a 117 ohm resistive load. The discharge voltage curve was basically linear from a start of 8.4 volts down to about 7 volts, that took about 8.5 hours This, to me, would be the useful life. The end of the curve was from 7 volts down to the cut off voltage of 6 volts, that part took about 20 minutes.
Keep in mind, this data was taken from the very first cycle of this battery. Li-ion cells will have a slightly greater capacity after a few cycles. My test results: Resistive load of 117 ohms, start voltage 8.5 v, end voltage 7 v, average discharge current 66 ma, battery capacity measured as 560 mAh.
These are made up from two Li-ion 3.7 v cells. They will never charge up to an actual 9 volts, 8.4 v is about it. If the device you are powering is OK with this voltage range (most are), then the EBL 9V Li-ion is a good replacement for a 9 v alkaline battery.
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